The background: That staccato voice, caught between a sob and a shriek, that rapid delivery, and the avant-garde approach to grime sonics – if you heard Scrufizzer's forthcoming single Rap Rave on the radio, you'd swear Dizzee Rascal's fifth album, originally mooted for release in December but evidently now put back till next year, had come early. It makes explicit the connection between the titular genres, or at least makes them make sense together.

"Who wants to hear my brand new sound?" asks Scrufizzer, and although you could argue with the "brand new" bit, there's no denying this is arresting enough to demand the inquiry.

It starts with synths like a dentist's drill squealing over a grinding industrial beat and electronic handclaps as Scrufizzer conducts the transition between the sort of experimental hip-hop the Neptunes might have produced for Clipse (the rap) and the brisker section (the rave). If you discovered this was Dizzee going back to angular basics you wouldn't flinch, mainly because you'd be too busy grinning with delight at his return to form.

Pleasingly for a grime artist who has been doing the rounds for a few years, Rap Rave doesn't represent a slide on Scrufizzer's part towards commerciality but a considerable advance on his previous work. We assumed he was some Chipmunk-style grime-lite chancer, but Rap Rave is nicely heavy on the noise and distinctly lacking in poppy unctuousness. It's shrill even for ears accustomed to Boy in da Corner, and that voice brooks no compromise.

And it's not as though he's hiding from the Rascal comparisons – in fact Dizzee invited him to feature on a track recently. We were expecting a watered down crossover bid from the pre-release chat about Scrufizzer's "diverse influences", from Amy Winehouse to Andre 3000, and broad taste in music – from garage, funky and drum'n'bass to classical and jazz – but the great thing about Rap Rave is how focused it is.

The mixtape, Fizzy Flow, is good, too, and although towards the end it devolves into raps over R&B/hip-hop samples, there is enough original grime material on it, courtesy of producers – Preditah, Paperboy and FDOT – to warrant investigation.

Mixed by DJ Semtex, you might recognise snippets of Watch the Throne's Niggas in Paris, Kendrick Lamar's the Recipe and Lauryn Hill's Lost Ones, but it's the savage sonics from the Brit boys, topped off by Scru's startled yelp, that excite most. The intro is pure eight-bit madness, and on Boom he sets out his vocal stall, all manic eruptions, cuts and thrusts.

Back on My Ball is very Dizzee but there is an edge here and an urgency that Dot Rotten and some other recent, rising grime stars have lacked. And even when he's boasting, as he does on Fizzy Flow, there is a quirky, surreal quality to his brags. On I Don't Wanna Scru the garage-y pizzicato strings suggest the involvement of MJ Cole – we did hear they were collaborating – as Mr Fizzer sticks it to poor old US rapper B.o.B., last heard being brought down in Tyler, the Creator's airplane.

Equally fine is Insane, another track on Scru's SoundCloud, on which his ludicrously fast rapping makes a mockery of the concept of "flow". There's nothing fluid about these jagged bursts of language, but there's something irresistibly idiosyncratic about this artist.

The buzz: "His energetic flow and vibe have made him one of grime's rising stars" – grmdaily.com.

The truth: Less Dizzee wannabe than original pirate material.

Most likely to: Go bonkers.

Least likely to: Go to Yonkers.

What to buy: The Fizzy Flow mixtape mixed by DJ Semtex is available for download/streaming now at soundcloud.com/scrufizzer. Rap Rave is released by Ministry of Sound/Stay Fizzy on 28 January.